21469579 has 2 divisors, whose sum is σ = 21469580. Its totient is φ = 21469578.

The previous prime is 21469573. The next prime is 21469607. The reversal of 21469579 is 97596412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21469579 - 2³ = 21469571 is a prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (21469571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734789 + 10734790.

It is an arithmetic number, because the mean of its divisors is an integer number (10734790).

Almost surely, 2^21469579 is an apocalyptic number.

21469579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21469579 is an equidigital number, since it uses as much as digits as its factorization.

21469579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 21469579 is about 4633.5277057551. The cubic root of 21469579 is about 277.9336789502.

The spelling of 21469579 in words is "twenty-one million, four hundred sixty-nine thousand, five hundred seventy-nine".